Finger for loom dobby



Aug. 2 ,.1926. 1,597,128

W. H. WAKEFIELD FINGER FOR LOOM DOBBY Filed March 18, 1926 #0 3553x 1 I/v I/E/V 7-0,?

LTE/E H M/rEF/ELD Patented Aug. 24, 1926.

UNITED STATES PATENT OFFICE.-

WALTER H. WAKEFIELD, or WORCESTER.MASSACHUSETTS, Assrenon r0 CROMPTON & KNOWLES LOOM worms. or woacnsrna, IEASSACHUSETTS, A CORPORATION or MASSACHUSETTS.

FINGER non. LOOM DOBBY.

Application filed March 18, 1926. Serial No. 95,727.

This invention relates to an improved finger for loom dobbies and it is the principal object of the invention to provide a finger of pressed metal having portions of reduced thickness to cooperate with a guiding comb and having other portions hardened to cooperate with the pegs of the pattern chain.

Loom dobbies usually employ a series of harness jacks or levers each of which. has connected thereto adobby back lever the upper and lower ends of which are each provided with a hook. The hooks are raised or lowered according to the requirements of the pattern by means of so-called dobby fingers and when lowered cooperate with one or another of oppositely reciprocating knives by means of which the jacks and harness frames are actuated. The fingers are raised by means of pegson the pattern chain, said pegs entering a groove formed in the bottom of each finger andthe dobby having a. guiding comb to hold the grooves in proper register with the pegs. It is a more particular object of my invention to provide a dobby finger of pressed sheet metal folded on'itself and having a guiding wing. to cooperate with the comb and having the lower edges thereof hardened to cooperate with the pegs, the inner ends of the fingers. being formed as arms for lifting the hooks. 7

With these and other objects in view which will appear as the description proceeds, my invention resides in the combination and arrangement of partshereinafter described and set forth in the claims.

In the accompanying drawings wherein I have shown a convenient embodiment of my invention,

Fig. 1 is a diagrammatic view taken through a dobby and showing my improved finger and the associated parts,

Fig. 2 is an enlarged elevation of a dobby finger,

Fig. 3 is a top plan view of the finger shown in Fig.2,

Fig. 4 is a plan of the blank for the finger I before the same is folded, v

Fig. 5 is a horizontal section on line 5-5 of Fig. 2,

Figs-6 and 7 are vertical sections on lines 6-6 and 77, respectively, of Fig. 2, Fig. 8 is a plan of the bearing forming section located between the folded sides of the fingenand I JAM Fig. 9 is a fragmentary plan view of the comb taken in thedirection of arrow 9, Fig. 1 and showing the relation of the separating wings and the dents of the comb.

Referring particularly to Fig. 1 it will be seen that the dobby comprises a harness jack 20 pivoted on a fixed pin 21 and having at}- tached' thereto as at 22 a dobby back lever 23. The latter has attached. to the upper'portion thereof a hook 24 which cooperates with a reciprocating knife 25 and has attached at the bottom thereof a second hook 26 which cooperates with a reciprocating knife 27. The knives 25 and 27 are connected so as to work in opposite directions simultaneously and fixed stops 28 engage the upper and lower ends of the levers 23 to limit'movement thereof to the left as shown in Fig. 1. The hook-s may rest on cross bars'29 when lowered to be engaged by the knives.

A dobby cylinder 30 is rotatably mounted on a shaft 31 and receives regular intermittent angular movement of such degree that at each pick of the loom a new dobby chain bar 32 will be brought into operative position with respect to the dobby finger to be described. Said chain bars are provided with pegs 33 of hardened steel which serve to indicate which hooks are to be loweredinto contact wth the knives. A guiding comb G comprises afixed bar 34 having upwardly extending wires 35 whicha-re spaced apart a distance substantially equal to the thick ness of the fingers and the distance between adjacent pegson the bars 32, as shown in Fig. 9. A rod 36 is provided for supporting the dobby fingers andupward displacement of the latter is prevented by arod 37 held in fixed position.

My invention relates to the construction of the fingers F and F which are raised and lowered according to the location of the pegs 33 and in carrying out my invention I provide a blank 40 of sheet steel or any other suitable material such as shown in Fig. 4, said blank being. for the finger F which raisesthe upper set of hooks 24. Said blank is provided with a pair of substantially parallel arms 41 and bearing portions .42, saidv arms and bearing portions being symmetrically disposed with respect to the 7 blank is proyidedwitlra wing43 having a lower straight edge l-t to cooperate with the bar 3st of the comb C. The intermediate portions of the blank are provided with p runs or arcnate edges as indicated at "a said edges or runs being flared as shown in Fig. Y at the time the blank stamped out. llhen the blank 4:0 is stamped out it is formed so that the arms and the bear tions are offset from the plane of th the otlset being about one-half the th ckness of the material indicated in Fig. 3. shown in l the oli'sets for the bea'r and arms are supposed to be below the p no of the body of the bank. The w is separated from the upper part of the blank sho i Fig. by narrow slot 4:6 and said bland is provided with further slot 4 which extends in vardly from the -ll to a point beyond the bearing portions said slotfacilitating bending of them?- set arms. Thebearing forming section as shown in Fig. 8 is provided with, ing portion 49 and an arm 50 similar to the bearing and arm portions of the blank shown in Fig. t.

In assembling, the blank to is folded along the line L, the upper portion being lent forwardly from the position shown in Fig. l. The wing l is not bent but remains as originally stamped to occupy the position shown in Fig. 2 after the folding o eration. The center bearing piece i8 is then put in place occupying the space located between the spaced arms ll and bearings 4-9., after which the parts are spot welded indicated at Y. The runs 45 will be left in substantial alignment by the foldm" process with the flared edges forming a go ve for the pegs 33. ened to resist wear. The wings her than the total thickness of cooperate with wires to position accurately with respect to the pegs flaring of the grooved edges does not GI:- tend to the straight edge l the latter having parallel sides as indicated in Fig. 3.

The linger F is formed in a manner similar to that described in connection with l with the exception that the arms The runs may then case hardare thinafter being welded are bent upwardly beyonl the line of fold L to cooperate with lower set of hooks. From the foregoing it will be seen that I have provided a pressed metal (lobby ,inge' having the principal portion thereof folded on itself to provide a boay portion of increased thickness ,and weight but having an extending, supporting wing of single thickness and that the grooved lower edges of tlie folded portionsare i lared topro ide a coni e eefer thedeb y Pe i i ns b in'a: a a ia resist wear alter the w ins ope at on has i has enthat as it sit-new f 7 i M V M been carriedout, Also,

greater than the width of the blank tions may be made therein by th in the art without departing from r-d scope of the invention, and

'ish to be limited to the details herein disclosed but whatl claim is:

1. in a loom dobb linger formed of sheet in tal, said linger having a body portion "olded on itself to foil-m a section of in- ::rea..,ed wdth and weight andsaid finger navin a separating wing portion extend- 'e folded portion to serve as a oed portions having the lower edges thereof flared anl hardened to form groove to cooperate with the pegs of the dobby chain. I p I p 2. A loom dobbyfinger formed of sheet metal having a portion folded on itself to be L 'shaped in section, a portion ofthe finr of singlethickness of material projecting beyond the folded portion to serve a guide, and the free lower edges of .the folded portion bein flared, each flared edge form with the other a groove for the pegs of the dobby chain. V

A loom dobby linger f rmed of sheet metal having a portion folded on itself to be U-shaped insection, aportion of the finger of single thickness of material projecting beyond the folded portion to serve as a guide, the free lower edges of the folded portion being flared, each flared edge forming with the other a groove for the pegs of the dobby chain, and bearing portions formed on the folded sides of the blank, said bearing portions being bent into substantialalignment. v N

l. A loom dobby linger formed of sheet metal having portion folded on itself to U-slape'd in section, a portion of the or of single thickness of material probeyond the folded portion to serve ide. thefre'e lower edges of the folded portion being fl area, each flared edge form ing with the other a groove for thepegs of the dobby cha n, and said bent portions hav- 6. blank fora p ssed metal loom dobby r-se f s d. and boa in L -lonis and per; rim: p'fort ons symmetrically disposed ab 'oiit the ce t line of fold and said blank furt" "r bann x di" lGO a guiding portion extending-on both sides of the line of fold, said lifting arm and bearing portions being offset slightly from the plane of the remainder of the blank.

7. A blank for a pressed metal loom dobby finger, said blank having extending arms and bearing portions and peg run portions all symmetrically disposed about the center line of fold and said blank further having a guiding portion extending on both sides of the line of fold, said lifting arm and bearing portions being oiiset slightly from the plane of the remainder of the blank, said blank being slotted along the offset portion from the point adjacent the arm to a point beyond the offset bearing portion.

8. A blank for a pressed metal loom dobby finger, said blank having extending arms and bearing portions and peg run portions 7 all symmetrically disposed about the center line of fold, and said blank further having a guiding portion extending on both sides of the line of fold, said guiding portion being disconnected from the remainder of the blank on one side of the line of .it'old.

9. A blank for a pressed metal dobby finger having a main portion to be bent on itself along a line of fold, said blank havinga guiding Wing portions of which extend on both sides of the line of fold and the guiding portion being disconnected from that portion of the blank lying on one side of the line of fold.

In testimony whereof I have hereunto atfixed my signature.

WALTER H. WAKEFIELD. 

